A washer replacement is often the quickest fix for a dripping faucet, but persistent leaks usually mean the underlying seal still isn’t forming correctly. Even small issues—like a misaligned stem or debris in the seat—can allow water to slip past.
Below are the most frequent reasons faucets keep leaking after a washer change, plus practical checks to pinpoint the problem.
1) The washer isn’t the right size or type
Not all washers are interchangeable. If the new washer is too thick, too thin, or the wrong shape for your faucet’s valve, the contact point won’t be tight enough. Some faucets also require specific materials (rubber, foam, or specialized compounds) depending on water conditions.
Double-check the washer size and make sure it matches your faucet model. If possible, confirm by comparing the old washer’s dimensions to the replacement.
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